JPH11247183A - Screwing type steel pipe pile with wing and its execution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a thin steel pipe without generating large torsion in the steel pipe by providing a torque transmission on an inner wall in the neighborhood of an edge part, transmitting torque in the neighborhood of the edge part of a steel pipe pile to be rotated, and advancing the steel pipe pile by the screw action of a wing to be buried. SOLUTION: The upper end of a torque transmission shaft 31 is connected to the rotation drive device of an execution machine, the torque is transmitted to the lower part of a steel pipe pile 1 through the torque transmission shaft 31, an engaging part 32 and a connection part 3, the steel pipe pile 1 is rotated, and advanced in the ground by the screw action of a wing 10 to be buried. When the steel pipe pile reaches a prescribed depth, the torque transmission shaft 31 is rotated in the contrary direction to the rotation direction of the rotation drive device, and connection members 4a, 4b and the leg part 35 of an engaging hole 34 are matched. Next, when the rotation drive device is pulled up, the engagement of the connection member and the engaging part is slipped off, the torque transmission shaft 31 is pulled up and the torque transmission device 30 is drawn out from the steel pipe pile 1. Thereby burying of the steel pipe pile 1 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwed steel pipe pile having wings, and a method of applying a rotating force to a tip of a steel pipe pile having wings at or near its tip, so that no soil is discharged into the ground. The present invention relates to a winged screw-in type steel pipe pile that can be buried and a method for constructing the pile.

[0002]

2. Description of the Related Art There have been many methods of embedding a steel pipe pile underground by applying a rotating force to a steel pipe pile having a wing plate attached to a tip portion or a side face of the steel pipe by a machine installed on the ground, and by a screw action. It has been proposed and some of them have been put to practical use, although they are intended for small diameter piles. Here, two inventions considered to be related to the present invention will be described below.

[0003] In the method of burying steel pipe piles described in Japanese Patent Publication No. 2-62848, a bottom plate is fixed to the lower end of the steel pipe pile body, an excavation blade is provided on the bottom plate, and the lower end of the pile body is provided on the outer peripheral surface. A steel pipe pile, which has a wing with a large wing width and almost twice the outer diameter of the pile body and is screwed into a pile, is screwed into soft ground. Pressing, excavating and softening the soil at the tip of the pile body with the excavating blade at the lower end, making the spiral wings bite into the unexcavated earth and sand on the side of the pile, and excavating while rotating and driving the pile as a reaction force against the strength of the soil The softened soil is extruded to the side of the pile and compressed, and the pile is screwed into the ground without discharging the soil (Prior Art 1).

A steel pipe pile described in Japanese Patent Application Laid-Open No. 7-292666 has a pair of spiral wings, each of which has a length of half a roll and an outer diameter of about 1.5 to 3 times the pile body. A plurality of steel pipe piles are fixed discontinuously relative to each other at the same height position on the outer peripheral surface of the lower end portion of the steel pipe pile with the same helical direction (prior art 2). The spiral blades shown in these prior arts 1 and 2 function not only as screws during construction but also as a support for obtaining a large ground reaction force.

[0005]

The steel pipe piles of the prior arts 1 and 2 are screwed into the ground by applying a torque to the pile head by a construction machine and buried. These steel pipe piles are propelled by wings attached to the tip and penetrate the ground. At this time, since a very large resistance acts on the wing, the steel pipe pile cannot be penetrated unless a torque exceeding the resistance is transmitted. When a torque is applied to the pile head, the pile body serves as a means for transmitting torque for screwing the wing, and the entire length of the pile is twisted by the torque. Therefore, a pile body that can withstand this torque is required at the time of construction, so it is necessary to secure a wall thickness or strength greater than the wall thickness or material necessary to guarantee the original support function of the pile. Economy.

The present invention has been made to solve the above problems, and has as its object to obtain the following screwed steel pipe pile with wings and a method for constructing the pile. (1) The thickness of the steel pipe pile can be reduced. (2) The steel pipe pile can be buried into the strong ground by screwing. (3) A large ground support force can be obtained using the wings. (4) Do not generate excessive stress on the steel pipe pile due to the bending moment transmitted from the wing.

[0007]

Means for Solving the Problems (1) A screwed steel pipe pile with wings according to the present invention has a connecting portion to which a torque transmitting device is capable of transmitting torque and is detachably connected to an inner wall near a tip end portion. It is constituted by a steel pipe with wings attached to the tip or lower periphery.

(2) Further, the screwed steel pipe pile with wings according to the present invention has a connecting portion to which a torque transmitting device can be torque-transmitted and detachably connected to an inner wall near the distal end portion, and the distal end portion or the outer periphery. And a steel pipe having a lower end joined to the short pipe.

(3) The blades of (1) and (2) are formed of flat steel blades or spiral blades. (4) Further, the steel pipe or the short pipe of the above (1) and (2) is provided with a substantially R-shaped wing mounting portion at the tip thereof. (5) Either the lower end portion or the short tube of the above-mentioned (2) was fitted into the other and integrally joined.

(6) The short pipe according to any of (2) to (5) is made of a steel material having a thickness greater than the thickness of the steel pipe or a strength greater than the strength of the steel pipe. (7) The torque transmission device according to the above (1) or (2) is constituted by a torque transmission shaft and a locking portion provided at a distal end thereof and connected to a connecting portion provided on a steel pipe or a distal end member.

(8) The method for constructing a screwed steel pipe pile with wings according to the present invention, wherein the tip of the torque transmission device inserted into the steel pipe pile is provided on the inner wall near the tip of the steel pipe pile. And the rotation of the torque transmission device driven by the construction machine is transmitted to the steel pipe pile, the steel pipe pile is propelled through the ground by the screw action of the wing and buried, and after the burial, the torque transmission device is connected to the steel pipe. It is designed to be pulled out from a stake.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] FIG. 1 is a perspective view showing a cross section of a part of a screwed steel pipe pile with wings according to Embodiment 1 of the present invention. In the drawing, 1 is a screwed steel pipe pile with wings (hereinafter simply referred to as a steel pipe pile), 2 is a steel pipe constituting the steel pipe pile 1, 3 is provided on an inner wall near a lower end of the steel pipe 2, and a torque transmission device described later is provided. A connecting portion 10 to which torque can be transmitted and which is detachably connected is a blade attached to a lower end portion of the steel pipe 2.

A plurality of (two are shown in the figure) connecting members 4a and 4b are provided on the inner wall near the distal end of the steel pipe 2 so as to face each other to form a connecting portion 3. As the connecting members 4a and 4b, those having a shape capable of transmitting torque, such as a circular or square cross section, are used. The tip of the steel pipe 2 has a pitch P of a spiral virtual line as shown in FIG. 2 (upside down for easy explanation).
Attachment portion 5 of wing 10 cut in a substantially rectangular shape (spiral shape) reaching the upper end after making one round from the lower end of stepped portion 6 corresponding to
Are formed. In this case, the pitch P formed by the steps 6 varies depending on the state of the ground in which the steel pipe pile 1 is buried, the outer diameter D of the steel pipe 2, and the like.
It is desirable to be about 0.6D (D is the outer diameter of the steel pipe 2) (the same applies to the following embodiments). When the pitch P is less than 0.1, the amount of penetration of the steel pipe pile 1 per rotation decreases, and when it exceeds 0.6D, the amount of penetration per rotation becomes too large. In this case, the torque required to perform the excavation becomes excessively large, and the excavation depth of the wing 10 increases.

[0014] Wings 10, as shown in FIG. 3, a circular steel plate 11 or an oval steel having an outer diameter D ₁ is divided into two from the center to form a flat steel blade 11a, 11b, the straight edge Is mounted on a line passing through the center from the stepped portion 6 of the mounting portion 5 of the steel pipe 2 and joined to the mounting portion 5 by welding to form a substantially spiral shape as a whole. In this case, the space formed by the straight edges of the steel wings 11a and 11b at the tip of the steel pipe 2 may be closed by a closing member. The outer diameter D ₁ of the blade 10 is generally (the same applies in the embodiments below) of about 1.5 to 3.0 times is desirable for the outer diameter D of the steel pipe 2.

Further, in the present embodiment, the case where the blade 10 is constituted by the two steel blades 11a and 11b whose sum of the internal angles is 360 ° is shown, but the circular steel plate 11 is divided into three equal parts and four equal parts. Then, a plurality of steel blades having a total inner angle of 360 ° may be attached to the distal end of the steel pipe 2 so as to form a substantially spiral shape as a whole to form the blade 10. As the number of steel blades increases, the shape becomes closer to a spiral shape. However, in actual construction, four blades are sufficient. If the number is too large, the function as a screw decreases and the blade mounting structure becomes unstable. Become
It is uneconomical because it only increases the installation time.

Referring again to FIG. 1, reference numeral 30 denotes a torque transmitting device, which comprises a torque transmitting shaft 31 and an engaging portion 32 provided at the tip of the torque transmitting shaft 31. A substantially T-shaped engagement hole 34 composed of a leg 35 and an arm 36 is provided corresponding to the connecting members 4 a and 4 b provided on the inner wall of the steel pipe 2. The width of the leg 35 of the engagement hole 34 is larger than the outer diameter of the connecting members 4a and 4b.
The height (width in the vertical direction) of the arm portion 36 is determined by the connecting members 4a, 4
It is formed slightly larger than the outer diameter of b.

When the steel pipe pile 1 is buried, first, the torque transmission device 30 is inserted into the steel pipe pile 1 from the engaging portion 32 side, and the leg 35 of the engaging hole 34 is fitted to the connecting members 4a, 4b. I do. Then, the torque transmission shaft 31 is rotated in the rotation direction of a rotation drive device of the construction machine described later, and one of the legs 36 of the engagement hole 34 is engaged with the coupling members 4a and 4b.

In this state, as shown in FIG. 4, the upper end of the torque transmission shaft 31 is connected to a rotary drive 41 mounted on the construction machine 40, and the rotary drive 41 is driven to reduce the torque. The power is transmitted to the lower portion of the steel pipe pile 1 via the transmission shaft 31, the engaging portion 32, and the connecting portion 3, and the steel pipe pile 1 is rotated to be propelled through the ground by the screw action of the wing 10 and buried. At this time, most of the tip opening of the steel pipe pile 1 is made of steel wings 11.
Since it is closed by a and 11b, the soil hardly enters the steel pipe pile 1.

When the steel pipe pile 1 is buried at a predetermined depth,
The torque transmission shaft 31 is slightly rotated in the direction opposite to the rotation direction of the rotary drive device 41, and the coupling members 4a, 4b and the engagement holes 3 are rotated.
4 and the leg 35 are aligned. Next, as shown in FIG. 5, when the rotary drive device 41 is pulled up, the connecting members 4a, 4
The engagement between the b and the engaging portion 32 is released, the torque transmission shaft 31 is pulled up, and the torque transmission device 30 is pulled out of the steel pipe pile 1. Thereby, embedding of the steel pipe pile 1 is completed.

When the steel pipe pile 1 is long, first, the steel pipe pile 1 (lower pile) is buried in the above-mentioned manner, the torque transmission device 30 is not pulled out, and the torque transmission shaft 31 is inserted. Is lifted with a crane or the like together with the torque transmission shaft 31. First, the upper and lower torque transmission shafts 31 are connected, and then the upper and lower steel pipes 2 are connected by welding. Then, the upper end of the connected torque transmission shaft 31 is connected to the rotation drive device 41 to rotate the tip of the lower pile, and the lower pile and the middle pile (upper pile) are buried in the ground. When the embedding is completed, the torque transmission shaft 31 is sequentially pulled up as described above. In this case, since there may be a projection such as a backing ring used for connecting the upper and lower steel pipes in the steel pipe, it is necessary to determine the size of the engaging portion 32 in consideration of the time of pulling.

For example, when the intermediate layer of the ground is strong, the torque transmission device 30 is used only when the tip of the steel pipe pile 1 reaches this intermediate layer, and the rotation driving device 41 is mounted on the lower part of the steel pipe pile 1. In the case of the ground where the rotation is transmitted and propelled and other large torque is not required, two piles of torque are transmitted by connecting the pile head of the steel pipe pile 1 to the rotation drive device 41 and transmitting the torque as in the conventional case. You may use a transmission means together.

According to the present embodiment as described above, the torque is transmitted by the torque transmitting device 30 to the vicinity of the tip of the steel pipe pile 1 and the steel pipe pile 1 is rotated. Because the steel pipe 2 is buried in the steel pipe, most of the steel pipe 2 is not used as a torque transmission medium, and the steel pipe 2 is not greatly twisted, so that a thin steel pipe 2 can be used. . Further, a steel wing 11 having both functions of closing the opening at the tip end of the steel pipe pile 1 and propulsion wings.
The a and 11b function as a support when a vertical force is exerted by an overlying structure or the like, and a large ground support force can be obtained.

FIG. 6 shows another example of the connecting portion 3 provided near the lower end portion of the steel pipe 2 and the engaging portion 32 of the torque transmitting device 30. 7 is a cross-shaped locking member made of a steel material attached to the inner wall near the lower end of the steel pipe 2;
The engagement member 37 is inserted into the space 7a with an engagement member which hangs down on the lower surface of the connecting body 33 constituting the engagement portion 32 corresponding to the space 7a formed by the locking member 7. When the torque transmission shaft 31 is rotated by the rotation of the
Is pressed to transmit torque to the steel pipe pile 1. By rotating the torque transmission shaft 31 in a slightly opposite direction, the torque transmission device 30 can be pulled out of the steel pipe pile 1. Note that the locking member 7 may be made of one steel material, and two engagement members 37 may be provided so as to sandwich the locking member 7 at opposite ends of the steel member. Further, as shown by a broken line, a member 37a orthogonal to the engagement member 37 may be provided at the tip end of each engagement member 37 to form the engagement member 37 in an inverted T-shape. With this configuration, the steel pipe pile 1 is screwed in connection with the connecting portion 3, and of course, the member 37 a of the engaging member 37 is hooked on the locking member 7 as necessary, and
Can be lifted upward.

FIG. 7 shows still another example of the connecting portion 3 and the engaging portion 32. In this embodiment, a rectangular pillar-shaped locking member 8 is erected at the center of the locking member 7 in the example of FIG. 6, and a larger diameter engaging portion 32 is attached to the tip of the torque transmission shaft 31. A rectangular engaging hole 3 opening on the lower surface of the engaging portion 32
8, the engaging hole 38 is detachably fitted to the locking member 8. In this example, the torque of the torque transmission shaft 31 can be transmitted to the lower portion of the steel pipe pile 1 by fitting the engagement hole 38 into the locking member 8.

FIG. 8 shows another example of the connecting portion 3 and the engaging portion 32. In this example, substantially T-shaped engaging members 9a and 9b are attached to face the inner wall of the lower end of the steel pipe 2. At the same time, an engagement portion 32 whose length is slightly shorter than the inner diameter of the steel pipe 2 is attached to the tip of the torque transmission shaft 31. In this example, the torque of the torque transmission shaft 31 is transmitted to the lower portion of the steel pipe pile 1 by obliquely inserting the engaging portion 32 and engaging the locking members 9a and 9b on the opposite side surfaces. Can be. Also in this example, by lengthening the arms of the locking members 9a and 9b, the engaging portion 32 can be hooked on the arms and the steel pipe pile 1 can be lifted upward. It should be noted that a block-shaped locking member is provided in place of the substantially T-shaped locking members 9a and 9b, and torque is transmitted by bringing the opposite side surfaces of the engaging portion 32 into contact with the locking member. It may be.

In the above description, the case where the connecting portion 3 is provided near the distal end portion of the steel pipe 2 and the engaging portion 32 is provided at the distal end portion of the torque transmitting device 30 has been described.
The engaging portion 32 may be provided on the steel pipe 2 side. As described above, an example of the connecting portion 3 and the engaging portion 32 has been described. However, the present invention is not limited to this, and the torque of the torque transmitting device 30 can be transmitted to the steel pipe 2 and the steel tube 2 can be detached. Any other structure may be used.

[Embodiment 2] FIG. 9 shows Embodiment 2 of the present invention.
It is a perspective view of. In the first embodiment, a spiral mounting part 5 is provided at the lower end of the steel pipe 2 constituting the steel pipe pile 1, and flat steel wings 11 a and 11 b are mounted on the mounting part 5 to configure the wing 10. Although the case where the connecting portion 3 with the torque transmitting device 30 is provided on the inner wall near the lower end portion of the steel pipe 2 has been shown, in the present embodiment, the steel pipe 2 constituting the steel pipe pile 1 and the wing 1
0 is attached and a portion (hereinafter referred to as a distal end member) 20 provided with the connecting portion 3 is formed separately.

That is, as shown in FIG. 10, at the tip of the short pipe 21 having the same outer diameter D and wall thickness t as the steel pipe 2, as shown in FIG. The connecting portion 3 (for example, the connecting member 4) described in the first embodiment is formed on the inner wall near the distal end portion of the short pipe 21.
a, 4b), the flat steel wing 1
The distal end member 20 is formed by attaching 1a and 11b. In this case, the connecting portion 3 may be provided after the steel wings 11a and 11b are attached. The upper end surface of the short pipe 21 of the tip member 20 and the lower end surface of the steel pipe 2 are brought into contact with each other and joined by butt welding to form the steel pipe pile 1.

The construction method, operation and effect of the steel pipe pile 1 according to the present embodiment are almost the same as those of the first embodiment, but since the tip member 20 and the steel pipe 2 are manufactured separately, the wing 10 and the connection The mounting of the part 3 is easy.

Third Embodiment In the second embodiment, the case where the end face of the steel pipe 2 and the end face of the short pipe 21 of the tip member 20 are joined by butt welding has been described.
One of the steel pipe 2 and the short pipe 21 of the tip member 20 is fitted into the other and the steel pipe pile 1 is formed by welding.

FIG. 11 is a perspective view showing an example of the present embodiment. As shown in FIG. 12, the short pipe 22 in this embodiment has a plate thickness substantially equal to the wall thickness t of the steel pipe 2, and a width (or length) of the short pipe 22 is slightly longer than the outer peripheral length of the steel pipe 2. By cutting, a parallelogram-shaped steel plate 23a is manufactured. Then, the steel plate 23a is formed into a cylindrical shape by bending as shown by an arrow, and both ends thereof are welded and joined, as shown in FIG. As a result, the upper and lower portions of the short pipe 22 are formed with the stepped portions 6 corresponding to the pitch P of the imaginary spiral line, and the attachment portions 5 of the wings 10 having a substantially L-shape are formed. In this case, the inner diameter D ₂ of the short pipe 22 is formed substantially equal to or slightly larger than the outer diameter D of the steel pipe 2.

FIG. 14 shows a cylindrical short tube 22 formed by bending a steel plate 23b cut into a trapezoidal shape as shown in FIG. 12, and a spiral mounting portion 5 having a pitch P is formed at the lower end. The upper end is almost horizontal. Note that the steel plate constituting the short tube 22 is not limited to a parallelogram or trapezoidal shape, but may be any rectangular shape such as a rectangular shape.

The short tube 22 thus constructed is provided with the connecting portion 3 (not shown) on the inner wall near the distal end, and the flat steel wings 11a and 11b are mounted on the mounting portion 5. To form the tip member 20. Then, the tip member 20
The lower end of the steel pipe 2 is fitted into the short pipe 22 to a predetermined position, and the upper edge of the short pipe 22 and the outer peripheral surface of the steel pipe 2 are welded and integrally joined to constitute the steel pipe pile 1. If a positioning stopper for fitting the steel pipe 2 into the short pipe 22 is provided on the outer peripheral surface of the steel pipe 2 or the inner peripheral surface of the short pipe 22, the vertical load is more reliably transmitted to the distal end. be able to. Before attaching the steel pipe blades 11a, 11b to the mounting portion 5, the short pipe 22
If the lower pipe 22 is welded to the upper edge of the short pipe 22 and the outer peripheral surface of the steel pipe 2 and the inner peripheral surface of the short pipe 22 and the lower edge of the steel pipe 2 are more reliably integrated. can do. Further, the connecting portion 3 may be provided on the inner wall near the lower end of the steel pipe 2.

In the above example, a case was shown in which the short pipe 22 having an inner diameter D ₁ substantially equal to or slightly larger than the outer diameter D of the steel pipe 2 was used, and the steel pipe 2 was fitted into the short pipe 22 and welded. ,
Figure 15 As shown in, using a short pipe slightly than or approximately equal to the inner diameter D ₃ of the steel pipe 2 smaller outer diameter D _4, the short pipe 2
2 may be fitted into the lower end of the steel pipe 2, and the lower edge of the steel pipe 2 and the outer periphery of the short pipe 22 may be welded to form the steel pipe pile 1.
Furthermore, the same L-shaped mounting portion as the tip of the short pipe 22 is formed at the tip of the steel pipe 2, and the tip of the steel pipe 2 inserted into the short pipe 22 is aligned with the tip of the short pipe 2. The attachment portions may be aligned, and the steel wings 11a and 11b may be joined to both attachment portions. Thereby, the rigidity of the tip portion of the steel pipe pile 1 can be increased.

The construction method, operation and effect of the steel pipe pile 1 according to this embodiment are almost the same as those of the first and second embodiments.
Since the short pipe 22 is manufactured by bending a steel plate, the manufacturing is easy, and one of the steel pipe 2 and the short pipe 22 of the tip member 20 is inserted into the other and joined by welding. Therefore, it is extremely easy to join the two.
Note that the short pipe 22 may be configured by cutting a steel pipe as described in the second embodiment.

[Embodiment 4] Next, the above-described Embodiments 1 to
A modification of the steel pipe pile 1 described in 3 will be described. In addition, in each of the following modified examples, the case where the steel pipe pile 1 is separated into the steel pipe 2 and the tip member 20 is shown. However, each of these modified examples can be naturally applied to the steel pipe pile 1 of the first embodiment. . Although the connecting portion 3 is not shown in each tip member 20 or the steel pipe 2, the connecting portion 3 with the torque transmitting device 30 is provided on the inner wall near the lower portion thereof (in each of the following embodiments). The same applies).

FIG. 16 is a perspective view showing a main part of the first modified example, in which steel wings 11a and 11b are attached to the lower end of a short tube 22 to constitute a tip member 20. The short pipe 22 is slightly longer than the outer peripheral length of the steel pipe 2 (or slightly longer than the inner peripheral length of the steel pipe 2) as shown in FIGS. Short) rectangular steel plate 2
4 is formed in a sawtooth shape as a stepped portion 6b having a height of half the pitch P of the imaginary spiral line described above. It is formed in a cylindrical shape as shown in the figure, and at the lower end thereof, two L-shaped mounting portions 5a and 5b are formed. In addition, the short pipe 22 is formed by joining two rectangular steel plates while displacing each other and bending the cylindrical steel plates to form the L-shaped mounting portions 5a and 5b.
It can be constituted by appropriate means.

The tip members 20 are formed by welding the steel wings 11a and 11b as shown in FIG. 3 to the attachment portions 5a and 5b of the short tube 22 by welding. When the steel pipe 2 is inserted, the steel pipe pile 1 is configured.
The construction method and operation and effect of this modification are almost the same as those of the first to third embodiments.

FIG. 19 is a perspective view of a second modification, in which the short tube 2
1 (hereinafter, including a short tube 22) is provided with a blade 10 made of square steel blades 12a and 12b at a lower end portion to constitute a tip member 20. The wing 10 has a very simple structure, for example, since it is composed of square steel wings 12a and 12b obtained by dividing a square steel plate 12 into two parts from the center as shown in FIG. The combined size of the steel wings 12a and 12b varies depending on the state of the ground in which the steel pipe pile 1 is buried, the outer diameter of the steel pipe 2, and the like. It is desirably about 0.0 times. Here, the size of the steel wings 12a and 12b refers to the steel plate 12 shown in FIG.
The length L of the diagonal line.

The construction method, operation, and effects of the steel pipe pile 1 according to this modification are almost the same as those of the above-described embodiments, but in this modification, when the steel pipe pile 1 penetrates the ground, The side of the excavation in the rotation direction is a steel wing 12a, 1
Since it is formed by the corners (maximum size part) of 2b,
The rear side of the tip surface tends to move away from the excavated ground. That is, the steel wings 12a and 12b have a flank behind the excavated portion. For this reason, the friction resistance at the time of penetration can be reduced as compared with a steel pipe pile having an outer circumferential arc-shaped wing in which the side surface at the rear of the excavated portion constantly contacts the excavated ground wall surface.

FIG. 21 shows another example of this modification.
In this example, instead of the square steel wings 12a and 12b, the triangular steel wings 13a and 13b obtained by dividing the triangular steel plate into two or cutting the square steel plate along the diagonal and dividing the steel plate into two parts are shortened. The distal end member 20 is configured by being attached to the distal end of a tube 21. The function of this example is almost the same as that of the example of FIG.

FIG. 22 shows still another example of this modification. In this example, the steel blades 14a and 14b are formed by dividing a hexagonal steel plate into two parts. The function of this example is almost the same as that of the example of FIG. 19, but by making the blade 10 closer to a circle, the supporting force characteristics are improved as compared with the square steel blades 12a and 12b.

In the above description, the case where the steel wing is constituted by dividing a triangular, quadrangular or hexagonal steel plate into two parts is shown. Wings may be configured. Further, in the above description, the case where the steel wing is configured by dividing the polygonal steel plate into two is shown.
The steel wing is constructed by dividing it into three or more parts.
May be sequentially attached to three or more attachment portions provided at the distal end portion.

FIG. 23 is a perspective view of a third modification. In this example, the rectangular pipe 2a is used as the steel pipe, and the short pipe 22a is used.
Is a square. In manufacturing the short pipe 22a, for example, four rectangular steel plates or L-shaped steel plates having inclined lower ends are welded in a square shape to form a substantially spiral mounting portion 5a at the lower end, and this mounting is performed. Steel wing 1 in section 5a
1a and 11b are attached to form a tip member 20. The size D (corresponding to the outer diameter of the steel pipe 2 in the first embodiment) of the square steel pipe 2a in the present modification refers to the length of a diagonal line of the square steel pipe. Also in this example, the short pipe 22a may be fitted into the square steel pipe 2a, or the square steel pipe 2 and the end of the short pipe 22a may be joined to each other.

The construction method and operational effects of the steel pipe pile 1 according to this modification are almost the same as those of the above embodiments, except that the steel pipe 2 and the short pipe 21 are made of a normal steel pipe (round). In the case of (1), the entire peripheral surfaces of the steel pipe 2 and the short pipe 21 are in sliding contact with the ground during screwing, so that the peripheral surface friction is large and a large torque is required. On the other hand, in the case of the square steel pipe 2a, when screwing, mainly the short pipe 22a is used.
In addition, since the corners of the square steel pipe 2a come into contact with the ground on the peripheral surface, the peripheral surface friction is small, so that the screwing torque can be reduced.

FIG. 24 is a perspective view of a fourth modification in which a steel pipe is constituted by a ribbed steel pipe 2b, and a tip member 2 is provided in the lower end thereof.
No. 0 short tube 22 (including the short tube 21) is fitted. That is, a plurality of ribs 2 are formed on the surface by rolling, for example.
The spiral rib 2c is formed on the outer peripheral surface by bending a steel plate provided with c. The pitch P of the rib 2c is substantially the same as the pitch P of the spiral virtual line of the first embodiment. In this embodiment, the ribbed steel pipe 2b and the short pipe 22 may be joined by abutting each other.

Although the construction method, operation, and effects of this modification are almost the same as those of the above embodiments, the screw rib 2c also contributes to propulsion when screwed into the ground.
Propulsion can be improved.

[Embodiment 5] In each of the above embodiments, a circular steel plate, an elliptical steel plate, a square steel plate or the like is divided into a plurality of equal parts to form steel wings 11a and 11b having a total inner angle of 360 °. This shows a case where the blade 10 is configured by attaching this to the tip of the steel pipe 2 or the tip member 20. In this embodiment, the sum of the internal angles of the steel blades 11a and 11b and the like is smaller than 360 ° or 360 °. It is formed larger. FIG.
5 to 28 show the present embodiment, and FIGS.
In the figure, the sum of the inner angles of the steel blades 11a and 11b is smaller than 360 °, and a gap 15 is formed between the steel blades 11a and 11b. 27 and 28 show the steel wing 11.
The sum of the inner angles of a and 11b is larger than 360 °, and an overlap 16 occurs between the steel blades 11a and 11b. In this case, for example, in mounting the steel wing 11b, a groove 5c continuous with the mounting portion 5 is provided above the stepped portion 6, and a part of the steel plate 11b is fitted into the groove 5c. Good.

According to the results of field tests and numerical analysis performed by the inventors, the steel blade 11
If the sum of the inner angles of a and 11b is smaller than 320 °, the penetration speed at the time of screwing in the steel pipe pile 1 will decrease, and the tip supporting force after embedding will decrease. In addition, when it exceeds 400 °, it has been found that in the gravel ground having a large particle size, the gravel is clogged between the blades 10 and the workability is deteriorated. For this reason, it is desirable that the sum of the internal angles of the steel blades 11a and 11b constituting the blade 10 be in the range of 320 ° to 400 °.

In this case, each steel wing 11 constituting the wing 10
It is not necessary to make all the inner angles of a and 11b equal, and they may be slightly different. Also, the gap 15 or the overlap 16 is set to 1
It is not necessary to concentrate on the place, the adjacent steel wings 11a, 1
1b may be provided as appropriate. Furthermore, steel wings 11a,
The number of 11b is not limited to two, but may be three or more (this embodiment can be implemented in other embodiments).

Embodiment 6 FIG. 29 is a perspective view of Embodiment 6 of the present invention. In the present embodiment, a closing member 18 is attached to and closed at a distal end opening of a cylindrical short tube 25 whose upper and lower ends are substantially parallel, and a flat steel wing 17a,
The tip member 20 is configured by providing the wing 10 made of 17b. The short pipe 25 is formed by cutting a steel pipe whose inner diameter is substantially equal to or slightly larger than the outer diameter of the steel pipe 2 or whose outer diameter is substantially equal to or slightly smaller than the inner diameter of the steel pipe 2 to a predetermined length. The closing member 18 is attached to the distal end by welding to close the distal opening. The short pipe 25 may be manufactured by bending a steel plate, and may have an outer diameter substantially equal to the outer diameter of the steel pipe 2.

As shown in FIG. 30, the outer diameter D _{5 of the} blade 10 is larger than the outer diameter of the steel pipe 2 (for example, D ₅ = 2D), and the inner diameter D _5
6 is a donut-shaped flat steel plate 17 approximately equal to the outer diameter of the steel pipe 2
Is divided into two from the center to form flat steel wings 17a and 17b. The steel wings 17a and 17b
5 is attached by welding along the imaginary spiral imaginary line at the pitch P assumed on the outer peripheral surface of the wing 5 and has a substantially spiral wing 1 as a whole.
0 is formed. Then, the steel pipe 2 is inserted or fitted into the distal end member 20 having the wing 10 on the outer periphery and the distal end opening thereof is closed, or the steel pipe pile 1 is formed by welding and joining.

In this embodiment, the sum of the internal angles is 360
The case where the wing 10 is constituted by two steel wings 11a and 11b of the same angle is shown, but the donut-shaped flat steel plate 11 is divided into three equal parts.
The blade 10 may be configured by dividing into four equal parts and attaching a plurality of steel blades having a total inner angle of 320 ° to 400 ° to the outer periphery of the short tube 25 so as to form a substantially spiral shape as a whole. . As the number of steel blades increases, the shape becomes closer to a spiral shape. However, in actual construction, four blades are sufficient. If the number is too large, the function as a screw decreases and the blade mounting structure becomes unstable. However, it is uneconomical only because the installation time is increased.

FIG. 31 shows another example of this embodiment. The flat steel blades 17a and 17b shown in FIG. 30 are arranged on the outer peripheral surface of the short tube 25 along the spiral virtual line. They are mounted at different angles and in different directions. In addition, the mounting structure of the wing 10 according to the present embodiment is the same as the above-described first to first embodiments.
5 can also be implemented. The attachment position of the wing 10 in FIG. 29 and FIG. 31 is desirably within 1D from the tip of the short pipe 25 in terms of screwing work of the steel pipe pile 1 and supporting force performance. In the above description, the steel wing 1 is attached to the short pipe 25.
Although the case where one stage wing 10 composed of 7a and 17b is provided is shown, two or more stages of wings may be provided.

FIG. 32 is a perspective view of still another example of the present embodiment. In this example, a relatively long short tube 21 is used, and a spiral wing 19 (see Embodiment 8 described later) is attached to the attachment portion 5 provided at the distal end thereof, and the wing 10 (hereinafter, referred to as a lower wing in this example). ), And on the outer periphery of the short pipe 21 above the spiral wing 19, the steel wings 1 at the same angle and in different directions along the spiral imaginary line of the pitch P.
7a and 17b are attached to form a blade 10a (hereinafter, referred to as an upper blade in this example). In this example, the case where the spiral wing 19 is attached to the tip of the short pipe 21 and the steel wings 17a and 17b are attached to the upper outer periphery is shown, but the lower wing 10 or the upper wing 10a is not limited to this. Instead, various blades described in each embodiment can be used as appropriate. Further, the upper wing 10a may be provided in two or more stages.

[Embodiment 7] By the way, when a vertical force acts on the steel pipe pile due to the weight of the mounted structure or seismic force after the construction is completed, the spiral wing receives a strong reaction force from the ground on the lower surface of the wing. As a result, as shown in FIG. 33, a large bending moment is generated at the root of the spiral blade, which is transmitted to the steel pipe to generate a large bending stress. As described in the specification of the prior art 2, the bending stress does not pose a serious problem in practical use if the outer diameter of the steel pipe is a small steel pipe pile having a diameter of about 100 to 200 mm. However, in steel pipe piles whose outer diameter is 500-600 mm, which is widely used,
It becomes a big problem in design.

As shown in the prior arts 1 and 2, the outer diameter of the spiral blade is 2 times the outer diameter of the steel pipe in terms of construction or supporting force.
It is said to be about twice as good. Here, the outer diameter of the steel pipe is 20
Compare 0mm steel pipe pile and 600mm steel pipe pile. Now, the outer diameter of each spiral wing is 40 times, which is twice the outer diameter of the steel pipe.
Assuming 0 mm and 1200 mm, the width of the spiral blade, that is, (wing outer diameter−steel pipe outer diameter) / 2, is 100 mm and 300 mm, respectively.
Becomes If the ground reaction force per unit area acting on the spiral blade is the same, the bending moment per unit circumference acting on the root of the spiral blade is proportional to the square of the width of the spiral blade.
The steel pipe having an outer diameter of 600 mm is about 9 times as large as the steel pipe having an outer diameter of 200 mm. For this reason, a very thick spiral blade is required.

On the other hand, a bending moment is transmitted from the spiral blade to the steel pipe near the root of the spiral blade, and a bending stress is generated. The magnitude of the bending moment transmitted to the steel pipe varies depending on the dimensions of the steel pipe, but is about 50 to 100% of the bending moment generated at the root of the spiral blade. For example, an outer diameter of 600
In the case of a steel pipe of mm, a bending moment of about 50 to 100% of the bending moment value of the spiral blade which requires a thickness of 40 mm or more by design acts on the steel pipe near the root of the spiral blade. Outer diameter 600
In the case of a steel pipe of mm, the wall thickness of the commonly used steel pipe is 5
It is about 12 mm, and the bending stress of the steel pipe caused by the ground reaction force greatly exceeds the design allowable bending stress of the steel pipe. To cope with this, the wall thickness is
Although it is conceivable to use steel pipes up to three times as large, the cost is remarkably increased, and it is unavoidable to design practically.

The present embodiment uses a steel plate having a thickness greater than the wall thickness of a steel pipe or a steel plate having a strength greater than the strength of a steel pipe in a portion of a steel pipe pile affected by bending stress. The stress generated in the portion affected by the bending stress is set within the allowable stress. FIG. 34 is a perspective view of the present embodiment, a part of which is shown in cross section. In the present embodiment, in Embodiments 2 to 7, the short pipe 21 (hereinafter, including the short pipes 22 and 25) is replaced with the steel pipe 2.
Thickness t thicker than the thickness steel t ₁ of, or short tube 21 which is constituted by larger steel than the strength of the steel pipe 2.

The plate thickness t ₁ of the short pipe 21 is determined by numerical analysis in consideration of the assumed ground reaction force.
For example, the outer diameter D of the steel pipe 2 is 500 mm, and the diameter D _{1 of the} blade 10 is
Is 1000 mm and a vertical load of 500 t is applied,
In a normal steel pipe, the portion where only the axial force acts is within the yield stress (2400 kgf / cm ² ) with a thickness of 14 mm, but the stress in the portion where both the axial force and the bending moment act is within the allowable value. For this purpose, a steel pipe having a thickness of about 20 mm is required. For this reason, the thickness of the steel pipe 2 is increased and the
The method of attaching 0 directly to a steel pipe is uneconomical.

Therefore, as described above, if a short pipe 21 having a thickness t ₁ larger than the thickness t of the steel pipe 2 or a short pipe having a strength greater than the strength of the steel pipe 2 is used in the portion where the bending moment acts, It is economical because it is not necessary to increase the thickness of the entire structure 2, and it can sufficiently cope with a large bending moment. In addition, since the short pipe 21 is formed by bending and welding a steel plate cut into a substantially strip shape as described above, or simply cutting the steel pipe to a predetermined length, various sizes corresponding to the applied load are used. be able to. In addition, according to the FEM analysis performed by the inventors, the length L ₂ of the short pipe 21 differs depending on the ground reaction force, but is generally 0.3 D
(D is the outer diameter of the steel pipe 2).

The construction method, operation and effect of this embodiment are as follows.
It is almost the same as each of the above embodiments, except that the wing 1
Since the short pipe 21 having a large thickness or high strength is disposed at a portion where the bending moment generated at 0 is transmitted, the short pipe 2
1 can be kept within an allowable value, and the bending moment generated by the wing 10 is not transmitted to the steel pipe pile 1. Further, with this, a steel pipe having a normal thickness can be used as the steel pipe 2, and the short pipe 21 can be manufactured without waste because the processing portion is small and the cost can be reduced.

[Eighth Embodiment] FIG. 35 is a perspective view of an eighth embodiment of the present invention. In Embodiments 1 to 7, the steel pipe 2
Alternatively, the short tube 21 (hereinafter, referred to as 22, 2) constituting the tip member 20
5), a flat steel wing 11
In the present embodiment, as shown in FIG. 35, flat steel wings 11a and 11b are attached.
A spiral wing 19 is attached in place of b and the like.

That is, for example, as shown in FIG.
An outer diameter D _{1 that is} larger than the outer diameter D of the steel pipe 2 (for example, D ₁ = 2
A small hole 19b is provided at the center of the circular steel plate 19a (or elliptical steel plate) of D), and cut from the small hole 19b to the outer peripheral portion to obtain a shape corresponding to the mounting portion 5 provided at the lower end of the steel pipe 2. The spiral blade 19 is formed by bending. A connecting portion 3 (not shown) for connecting to the torque transmitting device 30 is provided on the inner wall near the lower end of the steel pipe 2, and the spiral wing 19 is welded to the mounting portion 5 to form the steel pipe pile 1. is there. The small hole 19b provided in the center of the spiral wing 19 may be omitted, but if it is provided, it is desirable to close it later.

FIG. 37 shows another example of the present embodiment. In this embodiment, as shown in FIG. 38, the outer diameter of the steel pipe 2 is larger than the outer diameter of D is cut from the hole 19d of the donut-shaped steel plate 19c having a hole 19d substantially equal to or slightly larger than D to the outer periphery thereof.
The spiral wing 19 is formed by bending in accordance with a imaginary helical line having a pitch P assumed on the outer periphery of the helical wing. Then, the connecting portion 3 is provided on the inner wall near the lower end of the steel pipe 2, and the lower end opening is closed by the closing member 18. Next, the spiral wings 19 are attached to the outer periphery of the lower part of the steel pipe 2 along a imaginary spiral imaginary line, and welded to form the steel pipe pile 1.

In the above description, the case where the spiral wing 19 is attached to the lower end portion or the lower outer periphery of the steel pipe 2 has been described. However, the short pipe 21 (hereinafter, including 22 and 25) described in the second to seventh embodiments is described.
May be attached to the lower end portion or the outer periphery thereof. FIG.
4. The case where the circular (or elliptical) steel plate 19a or the donut-shaped steel plate 19c shown in FIG. 36 is cut at one place and bent is shown, but cut at several places and bent.
When attached to the steel pipe 2 or the short pipe 21, it may be formed into a continuous spiral shape.

[Ninth Embodiment] FIG. 39 is a perspective view of a ninth embodiment. 26 is a short pipe 21 (22,
25) The structure is almost the same as that of 25), but since the length of the steel pipe pile 1 reaches one-half or more (in some cases, one-half or less) of the total length of the steel pipe pile 1, it will be referred to as a strengthened steel pipe. . The lower wing 10 is attached to the tip of the strengthened steel pipe 26, and the upper wing 10a is attached to the outer periphery of the upper part.

In the above description, the spiral wing 19 is provided at the tip of the strengthened steel pipe 26, and the steel wings 17a, 17
Although the case where b is attached is shown, the lower blade 10 or the upper blade 10a is not limited to this, and various blades described in each embodiment can be appropriately used. Further, the upper wing 10a may be provided in two or more stages.

Also in this embodiment, the torque transmitting shaft 31 is inserted into the steel pipe pile 1 and the engaging portion 32 is provided at the lower portion of the reinforcing steel pipe 26 in the same manner as in the above-described embodiments. The steel pipe pile 1 is screwed into the ground and buried. At this time, the upper wing 10a contributes to the propulsion of the steel pipe pile 1 and improves the propulsive force.

[Embodiment 10] As the outer diameter of the steel pipe 2 increases, the outer diameter of the blade 10 also increases as described above, and accordingly, the thickness of the blade 10 also increases. As a result, for example, when the steel pipe pile 1 is screwed into the ground by the construction machine 40 as shown in FIG. 4, a large resistance due to the ground is applied to the ends of the steel wings 11 a and 11 b on the rotation direction side, and the torque is reduced. If it is weak, it may not be able to rotate and may not be able to penetrate the ground. For this reason,
There is a problem that the construction machine 40 must be enlarged. In the present embodiment, in order to solve such a problem, the cut-in portions (ends on the rotation direction side) of the steel wings 11a and 11b and the like are cut off at an acute angle to provide an inclined surface, thereby adding to the end portions. It reduces the resistance of the ground, makes it easier to penetrate into the ground, and reduces the torque. Note that, instead of the inclined surface, a digging blade for assisting digging may be attached to a biting portion such as the steel wings 11a and 11b. When screwing the steel pipe pile 1 into the ground and embedding it, the steel wings 11a, 11b are prevented from being deformed at their ends.
A reinforcing member may be attached to the bite portion such as b. This embodiment can be implemented in other embodiments.

[Comparative Example] The first embodiment of the present invention in which the length of the steel pipe 2 is 20 m, the outer diameter D is 500 mm, the diameter D _{1 of the} blade 10 is 1000 mm, and the connecting portion 3 is provided on the inner wall near the tip end.
And the steel pipe pile B having the same structure but not provided with the connecting part 3, the steel pipe pile 1 engages the connecting part 3 with the engaging part 32 of the torque transmission device 30, and the torque is increased. The transmission shaft 31 is connected to the rotation drive device 41 of the construction machine 40,
Steel pipe pile B has its pile head connected to rotary drive 41,
Various tests were performed by screwing and penetrating into the normal ground. As a result, it was found that even when the steel pipe pile B requires a steel pipe 2 having a thickness of 15 mm, the steel pipe pile A according to the present invention only needs to be a steel pipe 2 having a thickness of about 5 mm.

[0072]

(1) The screwed steel pipe pile with wings according to the present invention has a connecting portion to which a torque transmitting device is capable of transmitting torque and is detachably connected to an inner wall near the distal end portion. Consists of a steel pipe with wings attached to the outer circumference,
Torque is transmitted to the vicinity of the tip of the steel pipe pile by the construction machine and the torque transmission shaft and rotated, and the steel pipe pile is propelled and embedded by the screw action of the wing, so most of the steel pipe is used as the torque transmission medium. Since the steel pipe does not undergo large twisting, a thin steel pipe can be used, which is economical. Further, the wing having both the function of closing the opening at the tip end of the steel pipe pile and the function of the propulsion wing functions as a support when a vertical force is exerted by an overlying structure or the like, and a large ground support force can be obtained.

(2) The screwed steel pipe pile with wings according to the present invention has a connecting portion to which a torque transmitting device is capable of transmitting torque and is detachably connected to an inner wall near the distal end portion. In addition to the effect of the above (1), the connecting portion and the wing can be easily attached since the tip member made of the short pipe having the wing attached to the lower end and the steel pipe having the lower end joined to the short pipe are provided. There is an effect that there is.

(3) Since the wing of the above (1) or (2) is constituted by a flat steel wing or a spiral wing, a screwed steel pipe pile with wings having a large propulsive force by screwing and a large ground supporting force. Obtainable. Further, when the wing is formed of a flat steel wing, the manufacture of the wing is extremely easy.

(4) Since a substantially rectangular-shaped wing mounting portion is provided at the tip of the steel pipe or the short pipe of (1) or (2), the steel wing or the spiral wing can be easily mounted. .

(5) Either the lower end of the steel pipe or the short pipe of the above (2) is inserted into the other and joined together, so that the joining and welding of the steel pipe and the short pipe are easy and reliable. Can be done.

(6) Since the short pipe according to any of (2) to (5) is made of a steel material having a thickness greater than the thickness of the steel pipe or a strength greater than the strength of the steel pipe, a large bending moment is generated from the blade. Even if transmitted, no excessive stress is generated in the steel pipe pile. Further, it is economical because it is not necessary to increase the thickness of the entire steel pipe.

(7) The torque transmission device of (1) or (2) above is constituted by a torque transmission shaft and a locking portion provided at the distal end thereof and connected to a connecting portion provided at a steel pipe or a distal end member. Therefore, attachment / detachment to / from the connecting portion is easy, and the torque of the construction machine can be reliably transmitted to the steel pipe or the tip member.

(8) In the method for constructing a screw-in steel pipe pile with wings according to the present invention, the tip of the torque transmission device inserted into the steel pipe pile is connected to a connecting portion provided on the inner wall near the tip of the steel pipe pile. Then, the rotation of the torque transmission device driven by the construction machine is transmitted to the steel pipe pile, the steel pipe pile is propelled in the ground by the screw action of the wing and buried, and after the burial, the torque transmission device is removed from the steel pipe pile. Since it is made to be pulled out, the same effect as the above (1) can be obtained. Further, since the torque transmitting device is pulled out after the steel pipe pile is buried, the torque transmitting device can be used many times, which is economical.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention, a part of which is shown in cross section.

FIG. 2 is a perspective view of a lower end portion of the steel pipe of FIG.

FIG. 3 is an explanatory view of manufacturing the wing of FIG. 1;

FIG. 4 is an explanatory view of a method for constructing the steel pipe pile of FIG. 1;

FIG. 5 is an explanatory view of a method for constructing the steel pipe pile of FIG. 1;

FIG. 6 is a perspective view of another example of the connecting portion of the first embodiment and the engaging portion provided on the torque transmission device.

FIG. 7 is a perspective view of another example of the connecting portion and the engaging portion provided in the torque transmission device according to the first embodiment.

FIG. 8 is a perspective view of another example of the connecting portion and the engaging portion provided in the torque transmission device according to the first embodiment.

FIG. 9 is a perspective view of Embodiment 2 of the present invention.

FIG. 10 is a perspective view of the short tube of FIG. 9;

FIG. 11 is a perspective view of a third embodiment of the present invention.

FIG. 12 is an explanatory view of the production of the short tube of FIG. 11;

FIG. 13 is a perspective view of an example of a short tube.

FIG. 14 is a perspective view of another example of the short pipe.

FIG. 15 is a perspective view of another example of the third embodiment.

FIG. 16 is Embodiment 4 of the present invention and Embodiments 1 to 3;
It is a perspective view which shows the modification of the front-end member of FIG.

FIG. 17 is a perspective view of the short tube of FIG. 16;

FIG. 18 is an explanatory view of the production of the short tube of FIG. 16;

FIG. 19 is a perspective view of a modification of the tip member according to the first to third embodiments.

FIG. 20 is an explanatory view of the production of the short tube of FIG. 19;

FIG. 21 is a perspective view showing another example of FIG. 19;

FIG. 22 is a perspective view showing another example of FIG. 19;

FIG. 23 is a perspective view showing a modification of the first to third embodiments.

FIG. 24 is a perspective view showing a modification of the first to third embodiments.

FIG. 25 is a perspective view of a tip member according to the fifth embodiment of the present invention.

FIG. 26 is a bottom view of FIG. 25.

FIG. 27 is a perspective view of another example of the fifth embodiment.

FIG. 28 is a bottom view of FIG. 27.

FIG. 29 is a perspective view of Embodiment 6 of the present invention.

FIG. 30 is an explanatory view of the manufacture of the wing of FIG. 29;

FIG. 31 is a perspective view of another example of the sixth embodiment.

FIG. 32 is a perspective view of still another example of the sixth embodiment.

FIG. 33 is an explanatory diagram of a stress distribution of a steel pipe due to a ground reaction force applied to a wing.

FIG. 34 is a perspective view of a seventh embodiment of the present invention.

FIG. 35 is a perspective view of Embodiment 8 of the present invention.

FIG. 36 is an explanatory diagram of the manufacture of the wing of FIG. 35;

FIG. 37 is a perspective view of another example of the eighth embodiment.

FIG. 38 is an explanatory diagram of the manufacture of the wing of FIG. 37;

FIG. 39 is a perspective view of Embodiment 9 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steel pipe pile 2 Steel pipe 3 Connecting part 5 Attachment part 10 Wing 11a, 11b, 12a, 12b, 13a, 13b, 1
4a, 14b, 17a, 17b Steel wing 18 Closure member 19 Spiral wing 20 Tip member 21, 22, 22a, 25 Short pipe 30 Torque transmission device 31 Torque transmission shaft 32 Engagement part 40 Construction machine 41 Rotary drive device

Claims (8)

[Claims] 1. A torque transmitting device having a connecting portion to which a torque transmitting device is capable of transmitting torque and is detachably connected to an inner wall near a distal end portion,
A screwed steel pipe pile with wings, comprising a steel pipe having wings attached to the tip or lower periphery. 2. A connecting portion to which a torque transmitting device is removably connected to an inner wall near a distal end portion so as to be capable of transmitting a torque,
A screwed steel pipe pile with wings, comprising: a tip member made of a short pipe having a wing attached to a tip portion or an outer periphery; and a steel pipe having a lower end joined to the short pipe. 3. The screwed steel pipe pile with wings according to claim 1, wherein the wings are formed of flat steel wings or spiral wings. 4. The screwed steel pipe pile with wings according to claim 1 or 2, wherein a substantially ridge-shaped wing mounting portion is provided at the tip of the steel pipe or short pipe. 5. The steel pipe according to claim 2, wherein one of the lower end and the short pipe of the steel pipe is fitted into the other and integrally joined.
Screwed steel pipe pile with wings as described. 6. The screwed steel pipe with wings according to claim 2, wherein the short pipe is made of a steel material having a thickness greater than the thickness of the steel pipe or a strength greater than the strength of the steel pipe. Pile. 7. The torque transmission device according to claim 1, wherein the torque transmission device comprises a torque transmission shaft and a locking portion provided at a distal end thereof and connected to a connecting portion provided at a steel pipe or a distal end member. Screwed steel pipe pile with wings as described. 8. A front end of the torque transmission device inserted into the steel pipe pile is connected to a connecting portion provided on an inner wall near the front end of the steel pipe pile, and the rotation of the torque transmission device driven by a construction machine is performed. A method of constructing a screw-in type steel pipe pile with wings, wherein the torque is transmitted from the steel pipe pile to the steel pipe pile, the steel pipe pile is propelled in the ground by the screw action of the wing and buried, and the torque transmission device is pulled out from the steel pipe pile after burying. .